improved graph optimization

simulator/src/simulator-ui.ts

@@ -74,7 +74,7 @@ document.addEventListener('DOMContentLoaded', function() {
 		let resultsContainer = container.querySelector('.simulation-results');
 		
 		let batteryChargeGraph = new SvgDrawing.SvgElement(resultsContainer.querySelector('.battery-charge-graph svg'));
-		batteryChargeGraph.viewport.logical = { x: 0, y: 0, width: 365*24, height: parameters.batteryCapacity }
+		batteryChargeGraph.viewport.setLogical({ x: 0, y: 0, width: 365*24, height: parameters.batteryCapacity });
 		batteryChargeGraph.graph(simulationResult.batteryLevel);
 		
 		resultsContainer.classList.toggle('is-hidden', false);

simulator/src/svg-drawing.ts

@@ -6,11 +6,59 @@ namespace SvgDrawing {
 		height: number;
 	}
 	
+	export interface Point {
+		x: number;
+		y: number;
+	}
+	
+	export class Point {
+		public static add(a: Point, b: Point, out_result: Point) {
+			out_result.x = a.x + b.x;
+			out_result.y = a.y + b.y;
+		}
+		
+		public static subtract(a: Point, b: Point, out_result: Point) {
+			out_result.x = a.x - b.x;
+			out_result.y = a.y - b.y;
+		}
+		
+		public static normalize(v: Point) {
+			let invN = 1.0 / Math.sqrt(v.x*v.x + v.y*v.y);
+			v.x *= invN;
+			v.y *= invN;
+		}
+		
+		public static dot(a: Point, b: Point) {
+			return a.x*b.x + a.y*b.y;
+		}
+		
+		public static normalizedDot(a: Point, b: Point) {
+			let NA = Math.sqrt(a.x*a.x + a.y*a.y);
+			let NB = Math.sqrt(b.x*b.x + b.y*b.y);
+			return (a.x*b.x + a.y*b.y) / NA / NB;
+		}
+	}
+	
 	export class Viewport {
-		constructor(public logical: Rect, public view: Rect) {}
+		private invLogicalW: number = 0;
+		private invLogicalH: number = 0;
+		
+		constructor(private logical: Rect, private view: Rect) { this.update(); }
+		
+		setLogical(r: Rect) { this.logical = r; this.update(); }
 		
 		xLogicalToView(x: number) { return (x - this.logical.x) / this.logical.width * this.view.width + this.view.x; }
 		yLogicalToView(y: number) { return (y - this.logical.y) / this.logical.height * this.view.height + this.view.y; }
+		
+		logicalToView(p: Point, out_point: Point) {
+			out_point.x = (p.x - this.logical.x) * this.invLogicalW * this.view.width + this.view.x;
+			out_point.y = (p.y - this.logical.y) * this.invLogicalH * this.view.height + this.view.y;
+		}
+		
+		private update() {
+			this.invLogicalW = 1.0 / this.logical.width;
+			this.invLogicalH = 1.0 / this.logical.height;
+		}
 	}
 	
 	export class SvgElement {
@@ -25,52 +73,97 @@ namespace SvgDrawing {
 		graph(y: number[]): SVGPathElement;
 		graph(x: number[], y: number[]): SVGPathElement;
 		graph(arg1: number[], arg2?: number[]) {
-			let x: number[] | null = arg1;
-			let y: number[] = arg2;
-			if(!y) {
-				y = arg1;
-				x = null;
+			let read = (idx: number, out_point: Point) => {
+				out_point.x = arg1[idx];
+				out_point.y = arg2[idx];
+				return true;
+			};
+			
+			if(!arg2) {
+				read = (idx: number, out_point: Point) => {
+					out_point.x = idx;
+					out_point.y = arg1[idx];
+					return true;
+				};
 			}
 			
-			let num = y.length;
-			console.assert(!x || num == x.length);
+			let num = arg1.length;
+			console.assert(!arg2 || num == arg2.length);
 			
 			if(num <= 1) return null;
 			
-			let xStep = 6;
+			let optimizeCurveDist = 5;
+			let optimizeCurveAngle = 45.0;
+			if(optimizeCurveDist > 0 || optimizeCurveAngle < 0.0) {
+				let rawRead = read;
 				
-			let coordinates = 'M'+Math.round(this.viewport.xLogicalToView(x? x[0] : 0))+','+Math.round(this.viewport.yLogicalToView(y[0]));
-			coordinates += ' L';
-			let lineStartX = x ? x[0] : 0;
-			let prevX = lineStartX;
-			let prevY = y[0];
-			let yDir = y[1] > y[0] ? 1 : -1;
+				let dp = Math.cos(optimizeCurveAngle/180*Math.PI);
 				
-			let count = 0;
-			for(let idx = 0; idx < num; ++idx) {
-				let isLast = (idx == num - 1);
+				let lastDrawnPoint: Point = { x: 0, y: 0 };
+				read(0, lastDrawnPoint);
+				
+				let nextPoint: Point = { x: 0, y: 0 };
+				let dir: Point = { x: 0, y: 0 };
+				let nextDir: Point = { x: 0, y: 0 };
+				let nextSegDir: Point = { x: 0, y: 0 };
+				let perp: Point = { x: 0, y: 0 };
+				
+				read = (idx: number, out_point: Point) => {
+					rawRead(idx, out_point);
+					if(idx == 0 || idx == num - 1) return true;
 					
-				let newX = x ? x[idx] : idx;
-				let newY = y[idx];
-				let dir = isLast ? 0 : (y[idx+1] > newY ? 1 : -1);
+					rawRead(idx + 1, nextPoint);
+					Point.subtract(out_point, lastDrawnPoint, dir);
+					Point.subtract(nextPoint, out_point, nextSegDir);
 					
-				if(newX >= lineStartX + xStep || dir != yDir || isLast) {
-					coordinates += Math.round(this.viewport.xLogicalToView(newX))+','+Math.round(this.viewport.yLogicalToView(newY));
-					if(!isLast) coordinates += ' ';
-					lineStartX = newX;
-					yDir = isLast ? 0 : (y[idx+1] > newY ? 1 : -1);
-					++count;
+					if(Point.normalizedDot(dir, nextSegDir) < dp) {
+						lastDrawnPoint = { ...out_point };
+						return true;
 					}
-				prevY = newY;
+					
+					Point.subtract(nextPoint, lastDrawnPoint, nextDir);
+					
+					perp.x = -nextDir.y;
+					perp.y = nextDir.x;
+					Point.normalize(perp);
+					
+					let d = Math.abs(Point.dot(perp, dir));
+					if(d > optimizeCurveDist) {
+						lastDrawnPoint = { ...out_point };
+						return true;
 					}
 					
-			console.log(count);
+					return false;
+				}
+			}
+			
+			let startTime = performance.now();
+			let count = 0;
+			
+			let logicalPoint: Point = { x: 0, y: 0 };
+			let viewPoint: Point = { x: 0, y: 0 };
+			read(0, logicalPoint);
+			this.viewport.logicalToView(logicalPoint, viewPoint);
+			
+			let coordinates = 'M'+Math.round(viewPoint.x)+','+Math.round(viewPoint.y);
+			coordinates += ' L';
+			
+			for(let idx = 0; idx < num; ++idx) {
+				if(read(idx, logicalPoint)) {
+					this.viewport.logicalToView(logicalPoint, viewPoint);
+					coordinates += Math.round(viewPoint.x)+','+Math.round(viewPoint.y)+' ';
+					count += 1;
+				}
+			}
 			
 			let path = document.createElementNS('http://www.w3.org/2000/svg','path');
 			path.setAttribute('class','graph');
 			path.setAttribute('d', coordinates);
 			this.htmlElement.append(path);
 			
+			let endTime = performance.now();
+			console.log("graph: " + count + " points, " + (endTime - startTime) + "ms");
+			
 			return path;
 		}
 	}